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Overpressure, Maturation and Burial History

机译：超压，成熟和埋葬历史

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The phenomenon of overpressure in low-permeability Upper Cretaceous sandstone intervals is widespread in Rocky Mountain basins, including the Greater Green River Basin of southwestern Wyoming. This phenomenon is interpreted to be a direct result of gas generation in thick Cretaceous shales and in coal horizons and the migration of such gas into very low permeability reservoirs. Maturation of abundant source rock in the Upper Cretaceous section has caused long-term migration of ther-mpgenic gas into sandstones at a rate more rapid than that of gas escape. While there is some debate, at present, as to whether this overpressure in the Pinedale-Jonah area is consistent with a basin-centered gas accumulation model, there is no doubt whatsoever that it is a crucial determining factor for well productivity arid, therefore, commerciality. The distribution of overpressure in the northern Green River Basin i's complex and appears influenced by structure. Early observers of abnormal pressures in this area concluded that the phenomenon was imposed by tectonic compression (Rathburn, 1968). Later work, focusing on the regional nature of overpressure in the northern Green River Basin (Law et al., 1986), found that elevated pressure gradients existed in relatively unstressed portions of the basin and that gradients did not necessarily increase in more highly stressed areas. It is now generally believed, as noted above, that abnormal pressure has a non-tectonic origin. Nonetheless, it is also evident that structural influence of some kind does exist.
机译：低渗透性上白垩统砂岩层段中的超压现象在包括怀俄明州西南部的大绿河盆地在内的洛矶山脉盆地中普遍存在。这种现象被认为是在白垩纪厚页岩和煤层中产生气体的直接结果，并且是这种气体向极低渗透率储层的迁移。上白垩统段丰富的烃源岩的成熟导致热成因气体以比瓦斯逸出更快的速率长期迁移到砂岩中。目前，尽管人们对Pinedale-Jonah地区的这种超压是否与以盆地为中心的天然气成藏模式相一致尚存争议，但是毫无疑问，这是决定油井产能和干旱的关键决定因素，因此，商业性。北部绿河流域i处复杂的超压分布，并受结构影响。早期对该区域异常压力的观察者得出结论，该现象是由于构造压缩作用引起的（Rathburn，1968）。后来的工作着眼于格林河北部盆地超压的区域性（Law等，1986），发现该盆地相对无应力的部分存在高压梯度，并且在高应力区域不一定会升高。 。如上所述，现在通常认为异常压力具有非构造起源。但是，很明显，确实存在某种结构性影响。

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